CN112607646A

CN112607646A - Jack with replaceable contact component

Info

Publication number: CN112607646A
Application number: CN202011471179.0A
Authority: CN
Inventors: 周桂英; 韩三姑
Original assignee: Wenzhou Zhumo Machinery Technology Co ltd
Current assignee: Wenzhou Zhumo Machinery Technology Co ltd
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-04-06

Abstract

The invention relates to the field of jacks, in particular to a jack with a replaceable contact component, which comprises a lifting mechanism, an auxiliary mechanism, an angle mechanism and a replacement mechanism, wherein the lifting mechanism is arranged on the lifting mechanism; the setting through elevating system can realize under the condition that does not occupy unnecessary space with heavy object jack-up, and the design of folding accomodating has improved the portability of jack, can synchronous elevating system's the automatic extension of taking off and land through the setting of complementary unit, thereby play the purpose of the steady lift of complementary unit, in addition the area of contact on jack and ground has still been increased, avoid the jack to heel, the safety in utilization of jack has been improved, can adjust the contained angle between complementary unit and the elevating system according to the field usage limit through the setting of angle mechanism, thereby can improve the use flexibility ratio of jack, can freely replace different contact member according to the shape of being jacked the thing through the setting of replacement mechanism, thereby avoid being damaged by the jack-up thing at jacking in-process.

Description

Jack with replaceable contact component

Technical Field

The invention relates to the field of jacks, in particular to a jack with a replaceable contact component.

Background

The jack is light and small lifting equipment which takes a rigid jacking piece as a working device and jacks a heavy object through a top bracket or a bottom supporting claw within a small stroke. The jack is mainly used for the departments of factories, mines, transportation and the like as vehicle repair, other lifting, supporting and the like. The structure is light, firm, flexible and reliable, the lifting jack can be carried and operated by one person, the lifting jack is divided into a mechanical lifting jack, a hydraulic lifting jack and the like, and the principles are different.

In order to replace tires of a tire-burst automobile conveniently, an automobile manufacturer can place a jack which is convenient for replacing tires in an automobile trunk in advance before leaving a factory, when the automobile is parked on an uneven road surface, the traditional jack is not provided with an anti-toppling side protection device, so that the jacked automobile is prone suddenly, operators are injured, and the use safety and the applicability are reduced.

Disclosure of Invention

To solve the problems in the prior art, the present invention provides a jack in which a contact member can be replaced.

The technical scheme adopted by the invention for solving the technical problems is as follows: the jack capable of replacing the contact parts comprises a lifting mechanism, two auxiliary mechanisms, two angle mechanisms and two replacement mechanisms, wherein the two auxiliary mechanisms are used for preventing the lifting mechanism from tilting so as to ensure the use safety of the lifting mechanism and are arranged at two sides of the lifting mechanism for supporting heavy objects and facilitating folding and storage, the angle mechanisms for adjusting included angles between the auxiliary mechanisms and the lifting mechanism are arranged between the lifting mechanism and the auxiliary mechanisms, and the two angle mechanisms are used for facilitating replacement of the contact objects with different shapes and are arranged at the top ends of the lifting mechanism.

Specifically, elevating system includes receiver, first connecting rod, second connecting rod, commentaries on classics piece, elevator and lead screw, the top of receiver is equipped with the elevator, the bottom both ends of elevator rotate respectively there is one the second connecting rod, it has two to rotate in the middle of the inside of receiver first connecting rod, the top of first connecting rod rotate in the bottom of second connecting rod, two the bottom of second connecting rod is inside to be rotated respectively there is one the commentaries on classics piece, two common threaded connection has one between the commentaries on classics piece the lead screw, and two the internal thread of commentaries on classics piece is opposite.

Specifically, complementary unit includes first bull stick, first telescopic link, second telescopic link, third connecting rod and commentaries on classics piece, the both sides of receiver are equipped with one respectively first bull stick, first bull stick deviates from the one end of receiver is rotated and is had first telescopic link, the inside of first telescopic link is slided and is had the second telescopic link, the one end of second telescopic link extends to the top outside of first telescopic link, the second telescopic link is located the outside one end of first telescopic link is fixed with the third connecting rod, the third connecting rod with the cross sectional dimension of first telescopic link equals, the top of third connecting rod is rotated and is had the commentaries on classics piece, the top of commentaries on classics piece rotate in the bottom of elevator.

Specifically, angle mechanism includes fixed block, slide bar, pull ring, first spring, tooth post and spacing groove, the one end top of first bull stick is rotated and is connected with the fixed block, the one end of fixed block is fixed in the both sides middle part of receiver, the inside of fixed block slides and has the slide bar, the winding has on the lateral wall of slide bar first spring, the top of first spring is fixed in on the inner wall of fixed block and bottom mounting in on the lateral wall of slide bar, the top of slide bar extends to the top of fixed block is outside, just the slide bar is located the outside tip of fixed block rotates and has the pull ring, first bull stick is close to the inside of fixed block is equipped with the spacing groove, the inside block in spacing groove has the tooth post, the top of tooth post is fixed in the bottom of slide bar.

Specifically, replacement mechanism includes tray, draw runner, second spring and fixture block, the top of elevator is equipped with the tray, the bottom mounting of tray has to be the dovetail the draw runner, the draw runner slide in the inside of elevator, the inside slip of one end of draw runner has the fixture block, the top mounting of fixture block has the second spring, the top of second spring is fixed in on the inner wall of draw runner, the bottom block of fixture block in the inside of elevator.

It is specific, replacement mechanism still includes supplementary piece, third spring, first baffle and fourth spring, the bottom of elevator is equipped with first baffle, first baffle slide in the inside and one side of elevator are fixed with the third spring, the other end of third spring is fixed in on the interior jade of elevator, first baffle deviates from the one end of third spring is equipped with the cross-section and is three horn shapes supplementary piece, supplementary piece slide in the inside of elevator, being located of draw runner the inside one end of elevator is contradicted and is had the fourth spring, the other end of fourth spring is fixed in on the inner wall of elevator.

The invention has the beneficial effects that:

(1) the jack with the replaceable contact component can jack a heavy object without occupying redundant space by arranging the lifting mechanism, the portability of the jack is improved by the design of folding and accommodating, the auxiliary mechanisms are arranged at two sides of the lifting mechanism for supporting the heavy object, and the lifting mechanism can be synchronously lifted and descended and automatically extended by arranging the auxiliary mechanisms, so that the aim of stably lifting the lifting mechanism is fulfilled, in addition, the contact area between the jack and the ground is increased, the jack is prevented from tilting, the use safety of the jack is improved, namely, the first connecting rod and the second connecting rod are mutually rotatably connected, the first connecting rod and the lifting block and the second connecting rod and the storage box are rotatably connected, when the lifting block needs to be jacked, the screw rod is operated to rotate, and the screw post causes the two rotating blocks to move by utilizing a threaded connection mode, because the internal threads between the two rotating blocks are opposite, the two rotating blocks can be close to each other when the screw post rotates, the two rotating parts of the first connecting rod and the second connecting rod are close to each other, so that the lifting block can be lifted, further, a heavy object can be jacked without occupying redundant space, and the portability of the jack is improved by the folding and accommodating design, namely, the first rotating rod and the first telescopic rod are in sliding connection, the first telescopic rod and the second telescopic rod are in sliding connection, after the lifting block is jacked by the first connecting rod and the second connecting rod, the second telescopic rod can slide out to the outer side of the first telescopic rod along with the sliding, so that the lifting mechanism can be lifted and lowered automatically and synchronously, the purpose of assisting the lifting mechanism to lift stably is achieved, in addition, the contact area between the jack and the ground is increased, and the jack is prevented from tilting, the use safety of the jack is improved.

(2) The jack with the replaceable contact component, which is disclosed by the invention, has the advantages that the angle mechanism is arranged between the lifting mechanism and the auxiliary mechanism, the included angle between the auxiliary mechanism and the lifting mechanism can be freely adjusted according to the on-site use adjustment limit through the arrangement of the angle mechanism, so that the use flexibility of the jack can be improved, the replacement mechanism is arranged at the top end of the lifting mechanism, different contact components can be freely replaced according to the shape of a jacked object through the arrangement of the replacement mechanism, so that the jacked object is prevented from being damaged in the jacking process, the use effect of the jack is improved, namely, when the angle between the first rotating rod and the storage box needs to be adjusted, the pull ring at the top end of the fixed block is pulled firstly, the sliding rod moves towards the top end after compressing the first spring, namely, the bottom end of the sliding rod drives the tooth column to move towards the top end, so that the limit, at the moment, the first rotating rod can be freely rotated, after the first rotating rod is rotated to a proper position, the pull ring is not pulled, the tooth column is clamped in the limiting groove again, so that the first rotating rod is limited at a required position, and further, the included angle between the auxiliary mechanism and the lifting mechanism can be freely adjusted according to the on-site use and regulation limit, so that the use flexibility of the jack can be improved, namely, when the jack is lifted, a proper support block is required to be selected according to the shape of a lifted object, when the support is installed, the slide bar at the bottom end of the support is firstly pushed into the lifting block, when the support block is pushed to the limiting position, a clamping block in the slide bar is popped out to the outer side of the slide bar under the automatic reset of a third spring, so that the effect of preventing the slide bar from sliding out of the lifting block is achieved, when the current support is required to be replaced, the slide bar is only required to be continuously pushed, so that the clamping block crosses the, later the draw runner slides to the outside under the promotion of fourth spring, the fixture block drives supplementary piece and slides this moment, the inside of the draw runner is returned to the supplementary piece that finally fixture block passes through the slope, thereby accomplish the work of replacement, supplementary piece is after accomplishing supplementary work in addition, the third spring promotes supplementary piece through first baffle and moves initial position, thereby for supplementary preparation in advance next time, and then can freely replace different contact member according to the shape by the jack-up thing, thereby avoid being damaged by the jack-up thing at the jacking in-process, the result of use of this kind of jack has been improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a structural diagram illustrating the overall structure of a preferred embodiment of a jack with replaceable contact elements according to the present invention;

FIG. 2 is a schematic view of the connection structure of the lifting mechanism and the replacement mechanism shown in FIG. 1;

FIG. 3 is a schematic structural view of the lifting mechanism, the auxiliary mechanism and the angle mechanism shown in FIG. 1;

FIG. 4 is a schematic view showing a coupling structure of the assist mechanism and the angle mechanism shown in FIG. 3;

fig. 5 is an enlarged schematic view of a portion a shown in fig. 1.

In the figure: 1. the lifting mechanism, 11, a storage box, 12, a first connecting rod, 13, a second connecting rod, 14, a rotating block, 15, a lifting block, 16, a screw rod, 2, an auxiliary mechanism, 21, a first rotating rod, 22, a first telescopic rod, 23, a second telescopic rod, 24, a third connecting rod, 25, a rotating piece, 3, an angle mechanism, 31, a fixed block, 32, a sliding rod, 33, a pull ring, 34, a first spring, 35, a tooth column, 36, a limiting groove, 4, a replacing mechanism, 41, a support block, 42, a sliding strip, 43, a second spring, 44, a clamping block, 45, an auxiliary block, 46, a third spring, 47, a first baffle, 48 and a fourth spring.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, the contact component replaceable jack of the present invention includes a lifting mechanism 1, an auxiliary mechanism 2, an angle mechanism 3 and a replacing mechanism 4, wherein the auxiliary mechanism 2 for preventing the lifting mechanism 1 from tilting and ensuring the use safety is provided at two sides of the lifting mechanism 1 for supporting a heavy object and facilitating folding and storage, the angle mechanism 3 for adjusting an included angle between the auxiliary mechanism 2 and the lifting mechanism 1 is provided between the lifting mechanism 1 and the auxiliary mechanism 2, and the two angle mechanisms 3 are provided, and the replacing mechanism 4 for facilitating replacement of contact objects with different shapes is provided at the top end of the lifting mechanism 1.

Specifically, the lifting mechanism 1 comprises a storage box 11, a first connecting rod 12, a second connecting rod 13, a rotating block 14, a lifting block 15 and a screw rod 16, the top end of the storage box 11 is provided with the lifting block 15, the two ends of the bottom end of the lifting block 15 are respectively rotated by one of the second connecting rod 13, the first connecting rod 12 is rotated in the middle of the inside of the storage box 11, the top end of the first connecting rod 12 is rotated at the bottom end of the second connecting rod 13, the rotating block 14 is rotated by one of the bottom ends of the second connecting rod 13, the screw rod 16 is connected between the two rotating blocks 14 through common threads, the internal threads of the two rotating blocks 14 are opposite, because the first connecting rod 12 is rotatably connected with the second connecting rod 13, the first connecting rod 12 is rotatably connected with the lifting block 15, the second connecting rod 13 is rotatably connected with the storage box 11, when the lifting block 15 needs to be jacked up, the screw rod 16 is operated to rotate, the screw column 16 causes the two rotating blocks 14 to move in a threaded connection mode, and because the internal threads between the two rotating blocks 14 are opposite, the two rotating blocks 14 can be close to each other when the screw column 16 rotates, so that the two rotating parts of the first connecting rod 12 and the second connecting rod 13 are close to each other, the lifting block 15 is lifted up, heavy objects can be jacked up under the condition that no redundant space is occupied, and the portability of the jack is improved due to the folding storage design.

Specifically, the auxiliary mechanism 2 includes a first rotating rod 21, a first telescopic rod 22, a second telescopic rod 23, a third connecting rod 24 and a rotating member 25, two sides of the storage box 11 are respectively provided with one of the first rotating rod 21, one end of the first rotating rod 21 departing from the storage box 11 is rotated with the first telescopic rod 22, the second telescopic rod 23 slides inside the first telescopic rod 22, one end of the second telescopic rod 23 extends to the outer side of the top end of the first telescopic rod 22, one end of the second telescopic rod 23 located outside the first telescopic rod 22 is fixed with the third connecting rod 24, the cross-sectional dimensions of the third connecting rod 24 and the first telescopic rod 22 are equal, the top end of the third connecting rod 24 is rotated with the rotating member 25, the top end of the rotating member 25 is rotated at the bottom end of the lifting block 15, and as sliding connection is adopted between the first rotating rod 21 and the first telescopic rod 22, the first telescopic rod 22 and the second telescopic rod 23 are connected in a sliding manner, and after the lifting block 15 is jacked up by the first connecting rod 12 and the second connecting rod 13, the second telescopic rod 23 slides out of the first telescopic rod 22 along with the lifting block, so that the lifting mechanism 1 can be lifted and lowered automatically and synchronously, the purpose of assisting the lifting mechanism 1 to lift stably is achieved, in addition, the contact area between the jack and the ground is increased, the jack is prevented from heeling, and the use safety of the jack is improved.

Specifically, angle mechanism 3 includes fixed block 31, slide bar 32, pull ring 33, first spring 34, tooth post 35 and spacing groove 36, the one end top of first bull stick 21 is rotated and is connected with fixed block 31, the one end of fixed block 31 is fixed in the both sides middle part of receiver 11, the inside of fixed block 31 is slided and is had slide bar 32, it has to twine on the lateral wall of slide bar 32 first spring 34, the top of first spring 34 is fixed in on the inner wall of fixed block 31 and bottom mounting in on the lateral wall of slide bar 32, the top of slide bar 32 extends to the top outside of fixed block 31, just slide bar 32 is located the outside tip of fixed block 31 rotates and has pull ring 33, first bull stick 21 is close to the inside of fixed block 31 is equipped with spacing groove 36, the inside block of spacing groove 36 has tooth post 35, the top end of the tooth column 35 is fixed to the bottom end of the sliding rod 32, when the angle between the first rotating rod 21 and the storage box 11 needs to be adjusted, the pull ring 33 at the top end of the fixing block 31 is pulled first, the sliding rod 32 compresses the first spring 34 and then moves to the top end, that is, the bottom end of the sliding rod 32 drives the tooth column 35 to move to the top end, the limiting groove 36 is not limited by the tooth column 35, at this time, the first rotating rod 21 can be rotated freely, after the first rotating rod 21 is rotated to a proper position, the pull ring 33 is not pulled, the tooth column 35 is clamped in the limiting groove 36 again, so that the first rotating rod 21 is limited to a required position, and the included angle between the auxiliary mechanism 2 and the lifting mechanism 1 can be adjusted freely according to the adjustment limit of field use, thereby improving the use flexibility of the jack.

Specifically, the replacement mechanism 4 includes a holder 41, a slide 42, a second spring 43 and a fixture block 44, the holder 41 is disposed at the top end of the lifting block 15, the slide 42 in a dovetail shape is fixed at the bottom end of the holder 41, the slide 42 slides inside the lifting block 15, the fixture block 44 slides inside one end of the slide 42, the second spring 43 is fixed at the top end of the fixture block 44, the top end of the second spring 43 is fixed on the inner wall of the slide 42, the bottom end of the fixture block 44 is clamped inside the lifting block 15, since the appropriate holder 41 needs to be selected according to the shape of the object to be jacked when jacking is performed, when the holder 41 is installed, the slide 42 at the bottom end of the holder 41 is firstly pushed into the lifting block 15, and when the holder is pushed to a limit position, the fixture block 44 inside the slide 42 is automatically reset by the third spring 46 and then is ejected to the interior of the slide 42 The outer side of the lifting block 15 is prevented from sliding out of the sliding strip 42, when the current supporting table 41 needs to be replaced, the sliding strip 42 is pushed continuously, the fixture block 44 is made to cross the auxiliary block 45, then the sliding strip 42 slides outwards under the pushing of the fourth spring 48, the fixture block 44 drives the auxiliary block 45 to slide, finally the fixture block 44 retracts into the sliding strip 42 through the inclined auxiliary block 45, the replacement work is completed, different contact parts can be replaced freely according to the shape of the jacked object, the jacked object is prevented from being damaged in the jacking process, and the using effect of the jack is improved.

Specifically, replacement mechanism 4 still includes supplementary piece 45, third spring 46, first baffle 47 and fourth spring 48, the bottom of elevator 15 is equipped with first baffle 47, first baffle 47 slide in elevator 15's inside and one side are fixed with third spring 46, the other end of third spring 46 is fixed in on the interior wall of elevator 15, first baffle 47 deviates from the one end of third spring 46 is equipped with the cross-section and is the triangle supplementary piece 45, supplementary piece 45 slides in elevator 15's inside, the one end that is located of draw runner 42 inside has been contradicted fourth spring 48, the other end of fourth spring 48 is fixed in on elevator 15's the inner wall, supplementary piece 45 is after accomplishing supplementary the work of draw runner 42 roll-off, third spring 46 passes through first baffle 47 promotes supplementary piece 45 moves initial position, thereby making preparation for the next assist advance.

When the jack is used, the first connecting rod 12 and the second connecting rod 13 are rotationally connected, the first connecting rod 12 and the lifting block 15 and the second connecting rod 13 and the storage box 11 are rotationally connected, when the lifting block 15 needs to be jacked, the screw rod 16 is operated to rotate, the two rotating blocks 14 are moved by the screw column 16 in a threaded connection mode, and the two rotating blocks 14 are close to each other when the screw column 16 rotates due to the fact that internal threads between the two rotating blocks 14 are opposite, so that the two rotating parts of the first connecting rod 12 and the second connecting rod 13 are close to each other, the lifting block 15 is lifted, further, a heavy object can be jacked without occupying redundant space, and the portability of the jack is improved due to the folding and storage design; because the first rotating rod 21 and the first telescopic rod 22 are in sliding connection, and the first telescopic rod 22 and the second telescopic rod 23 are in sliding connection, after the lifting block 15 is jacked up by the first connecting rod 12 and the second connecting rod 13, the second telescopic rod 23 can slide out of the first telescopic rod 22 along with the lifting block, and then the lifting block can be lifted and lowered synchronously and automatically extended, so that the purpose of assisting the lifting mechanism 1 to lift stably is achieved, in addition, the contact area between the jack and the ground is increased, the jack is prevented from tilting, and the use safety of the jack is improved; when the angle between the first rotating rod 21 and the storage box 11 needs to be adjusted, the pull ring 33 at the top end of the fixing block 31 is pulled firstly, the sliding rod 32 moves towards the top end after compressing the first spring 34, namely the bottom end of the sliding rod 32 drives the tooth column 35 to move towards the top end, the limiting groove 36 is not limited by the tooth column 35, at the moment, the first rotating rod 21 can be freely rotated, after the first rotating rod 21 is rotated to a proper position, the pull ring 33 is not pulled, the tooth column 35 is clamped into the limiting groove 36 again, the first rotating rod 21 is limited at a required position, the included angle between the auxiliary mechanism 2 and the lifting mechanism 1 can be freely adjusted according to the adjustment limit of field use, and therefore the use flexibility of the jack can be improved; when jacking is carried out, a proper support block 41 is selected according to the shape of a jacked object, when the support block 41 is installed, the sliding strip 42 at the bottom end of the support block 41 is pushed into the lifting block 15, when the support block is pushed to a limiting position, the clamping block 44 in the sliding strip 42 is popped out to the outer side of the sliding strip 42 under the automatic reset of the third spring 46, so that the sliding strip 42 is prevented from sliding out of the lifting block 15, when the current support block 41 needs to be replaced, the sliding strip 42 only needs to be pushed continuously, the clamping block 44 is enabled to cross the auxiliary block 45, then the sliding strip 42 slides outwards under the pushing of the fourth spring 48, at the moment, the clamping block 44 drives the auxiliary block 45 to slide, and finally the clamping block 44 retracts into the inner part of the sliding strip 42 through the inclined auxiliary block 45, so that the replacement work is completed; after the auxiliary work of the other auxiliary block 45 is completed, the third spring 46 pushes the auxiliary block 45 to move to the initial position through the first baffle plate 47, so that preparation is made for the next auxiliary in advance, different contact parts can be freely replaced according to the shape of the jacked object, damage of the jacked object in the jacking process is avoided, and the using effect of the jack is improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The jack with replaceable contact components is characterized in that: including elevating system (1), complementary unit (2), angle mechanism (3) and replacement mechanism (4), be used for avoiding thereby elevating system (1) heels and guarantees its safe in utilization complementary unit (2) are located and are used for supporting the heavy object and convenient folding the accomodating the both sides of elevating system (1) are used for adjusting complementary unit (2) with contained angle between elevating system (1) angle mechanism (3) are located elevating system (1) with between complementary unit (2), just angle mechanism (3) are equipped with two, are used for conveniently replacing different shape contacts replacement mechanism (4) are located the top of elevating system (1).

2. The contact member replaceable jack of claim 1, wherein: elevating system (1) is including receiver (11), first connecting rod (12), second connecting rod (13), commentaries on classics piece (14), elevator (15) and lead screw (16), the top of receiver (11) is equipped with elevator (15), the bottom both ends of elevator (15) are rotated respectively there is one second connecting rod (13), it has two to rotate in the middle of the inside of receiver (11) first connecting rod (12), the top of first connecting rod (12) rotate in the bottom of second connecting rod (13), two the inside rotation respectively in bottom of second connecting rod (13) has one commentaries on classics piece (14), two common threaded connection has one between commentaries on classics piece (14) lead screw (16), and two the inside screw thread of commentaries on classics piece (14) is opposite.

3. The contact member replaceable jack of claim 2, wherein: the auxiliary mechanism (2) comprises a first rotating rod (21), a first telescopic rod (22), a second telescopic rod (23), a third connecting rod (24) and a rotating piece (25), wherein one first rotating rod (21) is arranged on each of two sides of the storage box (11), the first rotating rod (21) deviates from the storage box (11), the first telescopic rod (22) is rotated at one end of the first rotating rod (21), the second telescopic rod (23) slides inside the first telescopic rod (22), one end of the second telescopic rod (23) extends to the outer side of the top end of the first telescopic rod (22), the third connecting rod (24) is fixed at one end of the second telescopic rod (23) located outside the first telescopic rod (22), the cross-sectional dimension of the third connecting rod (24) is equal to that of the first telescopic rod (22), and the rotating piece (25) is rotated at the top end of the third connecting rod (24), the top end of the rotating piece (25) rotates at the bottom end of the lifting block (15).

4. A jack with replaceable contact member as claimed in claim 3, wherein: the angle mechanism (3) comprises a fixed block (31), a sliding rod (32), a pull ring (33), a first spring (34), a toothed column (35) and a limiting groove (36), the top of one end of the first rotating rod (21) is rotatably connected with the fixed block (31), one end of the fixed block (31) is fixed at the middle parts of two sides of the storage box (11), the sliding rod (32) slides inside the fixed block (31), the first spring (34) is wound on the side wall of the sliding rod (32), the top end of the first spring (34) is fixed on the inner wall of the fixed block (31) and the bottom end of the first spring is fixed on the side wall of the sliding rod (32), the top end of the sliding rod (32) extends to the outside of the top end of the fixed block (31), the sliding rod (32) is located at the end part outside the fixed block (31) and is rotated by the pull ring (33), the first rotating rod (21) is close to the inside of the fixed block (31) and is provided with the limiting groove (36), the tooth column (35) is clamped inside the limiting groove (36), and the top end of the tooth column (35) is fixed at the bottom end of the sliding rod (32).

5. The contact member replaceable jack of claim 2, wherein: replacement mechanism (4) are including tray (41), draw runner (42), second spring (43) and fixture block (44), the top of lifter (15) is equipped with tray (41), the bottom mounting of tray (41) is the dovetail slide runner (42), draw runner (42) slide in the inside of lifter (15), the inside slip of one end of draw runner (42) has fixture block (44), the top of fixture block (44) is fixed with second spring (43), the top of second spring (43) is fixed in on the inner wall of draw runner (42), the bottom block of fixture block (44) in the inside of lifter (15).

6. The contact member replaceable jack of claim 5, wherein: the replacement mechanism (4) further comprises an auxiliary block (45), a third spring (46), a first baffle (47) and a fourth spring (48), the bottom end of the lifting block (15) is provided with the first baffle (47), the first baffle (47) slides in the lifting block (15), and one side of the first baffle (47) is fixed with the third spring (46), the other end of the third spring (46) is fixed on the inner wall of the lifting block (15), one end of the first baffle plate (47) departing from the third spring (46) is provided with the auxiliary block (45) with a triangular section, the auxiliary block (45) slides in the lifting block (15), one end of the sliding strip (42) positioned in the lifting block (15) is abutted with the fourth spring (48), the other end of the fourth spring (48) is fixed on the inner wall of the lifting block (15).